Oh my post above might be only for the Additional Child Tax Credit. Here's 2 links that might help you understand it.
What is the Child Tax Credit
https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/child-tax-credit/L2lNhfGDl_US_e...
What is the Additional Child Tax Credit
https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/additional-child-tax-credit/L6x...
